A system and method for the offshore transfer of liquefied natural gas to a regasification plant is disclosed. Voltage supplied by the primary coil of a step-up transformer is switched by a transistor and the secondary coil of the step-up transformer causes the generation of secondary voltage. The control unit causes the lens assembly to assume any of a plurality of predetermined focal lengths so that different depths of an object being imaged can be rendered in-focus on the sensor. A second elastic band is adapted for engaging a thumb so that the apparatus may be used with only one hand. This is particularly important in systems that employ fast imaging techniques such as fast spin echo, where the invention can speed imaging substantially.